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<?php |
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namespace Vectorface\SnappyRouter\Di; |
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use \Exception; |
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/** |
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* A simple store for DI purposes. |
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* @copyright Copyright (c) 2014, VectorFace, Inc. |
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* @author Dan Bruce <[email protected]> |
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*/ |
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class Di implements DiInterface |
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{ |
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private $elements; // a cache of instantiated elements |
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private $elementMap; // the map between keys and their elements |
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private static $instance; // a static instance of this class for static use |
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/** |
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* Constructor for the class. |
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* @param array $elementMap An optional initial set of elements to use. |
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*/ |
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public function __construct($elementMap = array()) |
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{ |
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$this->elementMap = is_array($elementMap) ? $elementMap : array(); |
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$this->elements = array(); |
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} |
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/** |
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* Returns the element associated with the specified key. |
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* @param string $element The key for the element. |
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* @param boolean $useCache An optional flag for whether we can use the |
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* cached version of the element (defaults to true). |
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* @return Returns the associated element. |
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* @throws \Exception Throws an exception if no element is registered for |
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* the given key. |
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*/ |
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public function get($element, $useCache = true) |
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{ |
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if ($useCache && isset($this->elements[$element])) { |
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// return the cached version |
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return $this->elements[$element]; |
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} |
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if (isset($this->elementMap[$element])) { |
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if (is_callable($this->elementMap[$element])) { |
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// if we have callback, invoke it and cache the result |
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$this->elements[$element] = call_user_func( |
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$this->elementMap[$element], |
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$this |
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); |
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} else { |
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// otherwise simply cache the result and return it |
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$this->elements[$element] = $this->elementMap[$element]; |
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} |
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return $this->elements[$element]; |
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} |
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throw new Exception('No element registered for key: '.$element); |
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} |
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/** |
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* Assigns a specific element to the given key. This method will override |
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* any previously assigned element for the given key. |
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* @param string $key The key for the specified element. |
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* @param mixed $element The specified element. This can be an instance of the |
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* element or a callback to be invoked. |
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* @return Returns $this. |
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*/ |
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public function set($key, $element) |
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{ |
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// clear the cached element |
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unset($this->elements[$key]); |
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$this->elementMap[$key] = $element; |
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return $this; |
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} |
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/** |
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* Returns whether or not a given element has been registered. |
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* @param string $element The key for the element. |
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* @return Returns true if the element is registered and false otherwise. |
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*/ |
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public function hasElement($element) |
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{ |
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return isset($this->elementMap[$element]); |
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} |
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/** |
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* Returns an array of all registered keys. |
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* @return An array of all registered keys. |
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*/ |
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public function allRegisteredElements() |
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{ |
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return array_keys($this->elementMap); |
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} |
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/** |
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* Returns the current default DI instance. |
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* @return Di The current default DI instance. |
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*/ |
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public static function getDefault() |
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{ |
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if (isset(self::$instance)) { |
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return self::$instance; |
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} |
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self::$instance = new self(); |
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return self::$instance; |
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} |
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/** |
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* Sets the current default DI instance.. |
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* @param DiInterface $instance An instance of DI. |
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* @return Di Returns the new default DI instance. |
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*/ |
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public static function setDefault(DiInterface $instance) |
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{ |
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self::$instance = $instance; |
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return self::$instance; |
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} |
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/** |
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* Clears the current default DI instance. |
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*/ |
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public static function clearDefault() |
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{ |
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self::$instance = null; |
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1 |
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} |
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} |
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Vectorface /
SnappyRouter
